<!DOCTYPE html>
<html>

	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.wrapper {
				border: 2px solid black;
				overflow: hidden;
			}
			
			.wrapper .center {
				float: left;
				background: #F90;
				width: 100%;
			}
			
			.wrapper .center-wrapper {
				margin: 0 100px 0 100px;
			}
			
			.wrapper .left {
				float: left;
				margin-left: -100%;
				width: 100px;
				background: #6C0;
			}
			
			.wrapper .right {
				float: left;
				margin-left: -100px;
				width: 100px;
				background-color: silver;
			}
		</style>
	</head>

	<body>
		<div class="wrapper">
			<div class="center">
				<div class="center-wrapper">
					这是测试中间
				</div>

			</div>
			<div class="left">
				这是左边
			</div>
			<div class="right">
				这是右边
			</div>
		</div>
	</body>

</html>